Unfortunately, I don't think St. John's is it. We ran St. Johns from Montezuma and down Middle Fork last year and it isn't what we were looking for.
The way I remember this particular trail, we came out of Breck (up either Swan River valley or French Gulch), headed up a relatively easy trail next to a small creek on the left. Made a couple of switchbacks where there were some small mine reminents towards the top, and crested the hill on top of treeline (we also met some guys with built rigs from MHJC coming down). Above the treeline and one "level" of the summit, to the East was and awesome view of the Breck slopes. There was also a cabin on that edge of the summit that appeared to be an "oops, caught in the weather" cabin, with pots, pans, some canned food. Due West of this area the trail began a climb up the face of the hill, which was all dirt, big moguls and a pretty good incline. We watched as a Jeepster or Scout (can't remember) climbed right up it, an older Bronco died in the middle of the moguls and had to be winched over and an early 80s CJ went up and over. We were in a stock XJ and didn't venture up...I'm ready to tackle it, if I can ever find the darn thing!! I spent 4 hours today tooling around trails off of Georgia Pass and Middle Fork all to no avail!
I appreciate all of your help.